<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model="name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model="age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="sex">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click="add">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in list" :key="item.id">
          <td>{{ index + 1 }}</td>
          <td>{{ item.name }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.sex }}</td>
          <td>
            <button @click="del(item.id)">删除</button>
            <button>编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      flag:true,
      name: '',
      sex: '',
      age: '',
      id: '',

      list: [
        {
          name: '阿三',
          sex: '男',
          age: 18,
          id: 1,
        },
      ],
    }
  },
  methods: {
    add(id) {
      if (!this.name || !this.age || !this.sex) {
        alert('输入不合法')
        return
      }

      if (this.flag) {
        this.list.push({
        id: Math.random() * 10,
        name: this.name,
        sex: this.sex,
        age: this.age,
      })
      }
      if (!this.flag) {
        this.list.map(x => {
          if (this.id == x.id) {
            x.name = this.name
            x.age = this.age
            x.sex = this.sex
          }
        })
        this.flag = true
      }
      

      ;(this.age = ''), (this.name = ''), (this.sex = '')
    },
    del(id) {
      this.list = this.list.filter((x) => {
        return x.id !== id
      })
    },
  },
}
</script>